Beyerdynamic DT 290 用户手册

The headphones are fully adjustable and should be 

positioned for the best fit over the ears. This will give maximum

long-term comfort and will minimise sound leakage or spill.

Convention states that with the DT 280 / DT 290 / DT 290 V.11 /

DT 291 PV / DT 294 PV / DT 294 V.11 the boom microphone is

placed over the left ear. The microphone can be used from the

right ear, but if true L and R headphone status needs to be 

maintained, it will be necessary to make a custom lead with the

headphone connections reversed (swap brown/orange on the

left side and red/blue on the right side). For connections refer

to ”Block Diagram”.